bubblewrap 0.6.0

New features:

* New `--add-seccomp` option can be used to add more than one seccomp
  program (#453)
* Add a warning when repeating options where only the last one will be
  used, in particular `--seccomp` (#454)
* Add a Meson build system. (#432)
    * This can be used as a subproject by larger Meson projects. When
      used as a subproject, the `-Dprogram_prefix` option is required:
      see `tests/use-as-subproject/` for an example.
    * There is no equivalent of the `--with-priv-mode=setuid` option
      in this build system. Distributions that still require a setuid
      bubblewrap executable will need to `chown` and `chmod` the executable
      appropriately as a separate step in their packaging.
    * The Autotools build system is still supported in this release,
      but might be removed in a future release if the Meson build system
      is sufficiently successful.

Bug fixes:

* Invoke bash via `PATH` for better compatibility with non-FHS operating
  systems
* Exit early when `argc == 0`, to harden against the equivalent of
  CVE-2021-4034 (this is not a security issue in our case)

Other changes:

* The default branch is now named `main`
* Partial REUSE support (add SPDX-License-Identifier to many source files)
* Remove old CI integration

Git-EVTag-v0-SHA512: f07c0e1b6950c698683a802077ad954bdb6a94c62c01971a5eb5b7660376ff880c79f1b65c6eab7cf176933126572cc65ac8bb095b61141c44be16a6c44209fc
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